C the value of m and b doesn't affect the sign of the x-int
m is the slope of the line and b is the y-int
The discount is $109.50, so the sale price would be $245.50
The first one simplifies by collecting like terms to become:
7a²(4b²+9ab+10)
and the second one simplifies again by collecting like terms to become:
7u(16u²-49v²)
Got anymore questions, happy to help :)